The Motor Trade Association says the issue of diesel engines being affected by contaminated fuel is nowhere near as big as some people suggest.
The association conducted a nationwide survey, involving more than 30 specialist diesel repairers, following claims about the problems being caused.
It says results show the public may be getting an incomplete picture, as there has been no real increase in reported cases in the past three years.
The analysis showed the number of incidents has actually decreased in proportion to the number of diesel vehicles on the road.
The Automobile Association also says the findings dispel "anecdotal evidence" in the public domain.